Question -
Answer -
(a) Aerobic respiration andAnaerobic respiration
| Aerobic respiration | Anaerobic respiration |
| 1. | It uses oxygen for deriving energy. | 1. | It occurs in the absence of oxygen. |
| 2. | It occurs in cytoplasm and mitochondria. | 2. | It occurs in cytoplasm. |
| 3. | The end products of aerobic respiration are carbon dioxide and water. | 3. | The end products of fermentation are ethyl alcohol and carbon-dioxide. |
| 4. | Complete oxidation of respiratory substrate takes place. | 4. | Incomplete oxidation of respiratory substrate takes place. |
| 5. | 36-38 ATP molecules are produced. | 5. | Only 2 ATP molecules are produced. |
(b) Glycolysis andFermentation
| Glycolysis | | Fermentation |
| 1. | Glycolysis occurs during aerobic and anaerobic respiration. | 1. | Fermentation is a type of anaerobic respiration. |
| 2. | Pyruvic acid is produced as its end product. | 2. | Ethanol or lactic acid is produced as its end product. |
(c) Glycolysis andcitric acid cycle
| Glycolysis | Citric acid cycle (Krebs cycle) |
| 1. | It is a linear pathway. | 1. | It is a cyclic pathway. |
| 2. | It occurs in the cell cytoplasm. | 2. | It occurs in the mitochondrial matrix. |
| 3. | It occurs in both aerobic and anaerobic respiration. | 3. | It occurs in aerobic respiration. |
| 4. | One glucose molecule breaks down to generate 2 NADH2 and 2 ATP molecules. | 4. | It produces 6 NADH2, 2 FADH2, and 2 ATP molecules on breakdown of two acetyl-coA molecules. |